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What is the rule of -3,18,-108,—,—,—

User Grigor Gevorgyan
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2 Answers

13 votes
13 votes


\textbf{Heya !}

✏✏
\large\textsf{Given:-}

  • The first 3 terms of a sequence :-
    \large\textsf{-3, 18, -108}

✏✏
\large\textsf{To Find:-}}

  • The rule for the sequence = ?

✏✏
\large\textsf{Solution Steps:-}

What do we multiply each term of the sequence by to arrive at the next one ? we can find that by dividing the last term of the sequence, -108, by the middle term, 18:-


\large{\sf{\longmapsto{-108/18=-6}

Now divide 18 by the first term (-3) :-


\longmapsto\sf{18/-3=-6}

we arrived at -6 twice, So the rule for this sequence is:- "Multiply by -6, And you'll arrive at the next term"

`hope it helped ~ :D

User Osakr
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28 votes
28 votes

Hi!

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The rule for this sequence is 'multiply by -6'.

Verification ↓

-3*(-6)
\stackrel\checkmark{=}18

18*(-6)
\stackrel\checkmark{=}-108

So the rule for the sequence is 'multiply by -6'

And the Common ratio is -6.

Hope that made sense !!

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\star\tiny\pmb{calligraphy}\star

User Alfwatt
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